The never-ending current flow of superconductors could offer new options for energy storage as well as efficient transmission and generation of electrical energy, to name but a few. However, the electrical resistance of zero signature superconductors is only achieved below a certain critical temperature, hundreds of degrees Celsius below freezing, and is very expensive to manufacture.
Physicists at the University of Belgrade in Serbia believe that they have found a way to manipulate super-thin, discoidal monolayers of superconductors such as graphene, a monolayer of carbon, to modify material properties to create new artificial materials for future devices. The results of the group's theoretical calculations and experimental approaches were published in Journal of Applied Physics .
"The application of biaxial tension leads to an increase in critical temperature, suggesting that high-temperature superconductivity is achieved under load more easily," said first author of the study of the LEX Laboratory of the University of Belgrade, Vladan Celebonovic.
The team investigated how the conductivity in low-dimensional materials such as lithium-doped graphene under different types of forces changed a "strain" of the material. The deformation technique has been used to fine tune the properties of bulkier materials. The advantage of deforming materials with small dimensions and a thickness of only one atom is that they can withstand large deformations without breaking.
Conductivity Depends on Movement Although it took seven months of hard work to accurately derive the math to describe this motion in the Hubbard model, the team was finally able to theoretically study electron vibration and electron transport. In addition to calculation methods, these models have shown how the load changes the doped graphene and magnesium diboride monolayers.
"When a low-dimensional material is subjected to stress, the value of all material parameters changes, which means that there is a possibility that the design of materials to our needs for all types of applications," said Celebonovic Manipulation of strains with the chemical adaptability of graphene provides the potential for a variety of potential new materials. In view of the high elasticity, strength and optical transparency of graphene, the applicability could be far-reaching – think of flexible electronics and opto-electrical components.
Celebonovic and colleagues tested one step further as two different approaches to elongation of thin monolayers of graphene impact lattice structure and conductivity of the 2D material. For liquid-phase "exfoliated" graphene films, the team found that strains pulled apart individual flocs, increasing resistance, a feature that could be used to make sensors such as touchscreens and E-Skin a thin electronic material after human skin.
"In atomic force microscopy on micromechanically exfoliated graphene samples, we have shown that the trenches created in graphene can provide an excellent platform for studying local changes in graphene conductivity due to strain, and these results may be in line with our theoretical prediction of the effects of strain related to the conductivity in one-dimensional systems, "said Jelena Pesic, another author of Graphene Laboratory, University of Belgrade.
Even though the team foresees many Englisch: bio-pro.de/en/region/stern/magazine/…2/index.html The challenge is to experimentally implement the theoretical calculations from this paper that their work could soon "revolutionize" the field of nanotechnology. "
Magnetic graphene switches between insulator and conductor
V. Celebonovic et al., Selected Transport, Vibrational, and Mechanical Properties of Low-Dimensional Systems Under Load, Journal of Applied Physics (2019). DOI: 10.1063 / 1.5054120
Elongation Enables New Applications of 2D Materials (2019, May 21)
retrieved on May 22, 2019
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